How Buildering Works

In the introduction to one of his guides, Ard Arvin offers the following disclaimer: "Buildering always results in serious injury and horrible death. Buildering is illegal. You will be caught, charged with trespassing and spend years in jail." The first point is enough to scare me away from buildering -- the second is icing on the cake. So it's impossible for me to understand what drives a guy like Alain Robert, especially after suffering such terrible injuries from that fall when he was 19.